This repository contains SPICE simulations of NMOS, PMOS, and CMOS inverters using various device models.
It is designed to help students, researchers, and enthusiasts understand MOSFET device behavior, CMOS inverter characteristics, and circuit robustness under different operating conditions.
The simulations explore both DC and transient behaviors, considering parameter variations, device sizing, and supply voltage effects. 🔍
- Understand the structure and operation of NMOS transistors.
- Study threshold voltage, channel voltage distribution, and operation regions: Cutoff, Linear (Triode), and Saturation.
- Observe how drain current (Id) varies with drain-source voltage (Vds) and gate-source voltage (Vgs).
- Learn the importance of SPICE in circuit design and verification.
- Get familiar with SPICE deck components:
- Parameters: process constants that are necessary (body effect coefficient, threshold voltage, etc.) ⚙️
- Netlist: textual representation of the circuit and wiring 📝
- Models: definitions describing the behavior of devices / formulas 📐
- Simulate Id-Vds characteristics for different gate voltages - DAY1.
- Study velocity saturation effects in short-channel MOSFETs using Id-Vgs curves - DAY2.
- Understand the structure and operation of CMOS inverters.
- Derive Voltage Transfer Characteristics (VTC) from load curves.
- Simulate transient response to input transitions using SPICE.
- Analyze switching threshold variations due to device sizing- DAY3.
- Evaluate noise margins:
VIL,VIH,VOL,VOH🔊 - DAY4 - Study the effect of PMOS sizing on inverter switching threshold.
- Investigate how supply voltage variation and device parameter variations affect the VTC- DAY5.
- All simulations are performed under typical-typical (TT) corner conditions.
- Ambient temperature for simulations: 27°C 🌞
- Parameters are set to study device behavior and inverter robustness realistically.
This repository is a reflection of my hands-on learning experience for understanding CMOS circuit design and MOSFET behavior through NGSPICE (CMOS SPICE SIMULATION - VSD) ⚡